Oakland A's right fielder Josh Reddick joined an exclusive club Thursday when he hit his 30th and 31st home runs of the season, becoming just the 18th player in the franchise's Oakland history to bash at least 30 homers in a season.

The guy who had hit 10 homers in 375 career at-bats entering the season now stands alongside some of the most prolific home runs hitters of their generations -- as well as a couple unlikely candidates to accomplish the feat.

Reaching 30 "is a great personal achievement," said Reddick, who was acquire from the Red Sox in the offseason and is completing his first full season in the majors. "I didn't really think I'd do that this year."

He did, and now he finds himself on the franchise's short list of power hitters along with the likes of Mark McGwire, who did it a franchise-record eight times, Reggie Jackson, Jose Canseco, Jason Giambi, Frank Thomas and Miguel Tejada as Oakland's most prolific single-season boppers.

Reddick is the first A's player to pass the milestone since Jack Cust in 2008.

Here is a complete look at the A's 30-homer club, listed alphabetically:

Tony Armas: Acquired from the Pirates in a 1977 spring training deal as a raw 22-year-old, it took a couple years before everything came together in a 35-homer breakout for the 1980 Billy Ball squad. Armas won two A.L. home run titles in the next four seasons -- hitting 22 in a strike-shorted 1981 for the A's and blasting 43 for the Red Sox in 1984.

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Sal Bando: The captain of the Swingin' A's of the 1970s hit 31 in 1969 -- the only Oakland player other than Reggie Jackson to have a 30-homer season during that era and the only 30-homer season of Bando's career.

Geronimo Berroa: The Chief didn't have much of a career before or after his stint with the A's, but in 1996 he was one of the most productive sluggers in the league, belting 36 homers.

Jose Canseco: Mr. 40-40 had five 30-homer seasons in six seasons with the A's from 1986-91, twice winning the A.L. home run titles -- hitting 42 homers in his MVP season of 1988 (when he also stole 40 bases) and bashing 44 in 1991.

Eric Chavez: The six-time Gold Glove third baseman didn't display jaw-dropping power, but he was a consistent threat, hitting at least 26 homers six consecutive seasons from 200-05, including 30-homer seasons in '01 and '02.

Jack Cust: A prolific power hitter in the minors who struggled in brief auditions with four other big-league teams, Cust got a chance with the A's because of his mix of power and ability to get on base and produced on both counts in a huge way in 2007. He struck out 197 times and hit just .231, but also walked 111 times and swatted 33 homers.

Jason Giambi: The ringleader of the A's rolicking teams in the late 1990s and early 2000s in the clubhouse as well as in the middle of the lineup. Giambi hit 43 homers in 2000 en route to winning the A.L. MVP, and then another 38 as the MVP runner-up the following season before leaving for the Bronx as a free agent.

Reggie Jackson: Before he became Mr. October with the Yankees, Reggie hit at least 30 homers four times in a seven-year stretch through 1975, including a career-high 47 in 1969. Oddly, all his 30-plus homer seasons with the A's came in odd-numbered years: 1969, 1971, 1973 and 1975.

John Jaha: Injuries plagued Jaha throughout his career, but he had one last hurrah in 1999 -- his first with the A's -- hitting a career high 34 home runs to help the team make a run at the playoffs after four straight last-place or second-to-last-place finishes.

Dave Kingman: The towering King Kong brought his prodigious power to Oakland to end his career, and he ended with a bang. Kingman hit 35, 30 and 35 home runs in his three seasons with the A's -- the only time he hit at least 30 in three successive seasons during a 16-year career that produced 442 long balls.

Mark McGwire: This Bash Brother burst on the scene with 49 homers as a rookie, the first of eight 30-homer seasons in 10 seasons -- including 34 before he was traded to St. Louis at the trade deadline in 1996. His 52 homers in 1996 are an Oakland single-season record and half of the 10 A's 39-plus homer seasons were produced by Big Mac.

Dwayne Murphy: Often overlooked nationally playing alongside Rickey Henderson and Tony Armas, but the six-time gold glove center fielder hit an attention-grabbing 33 homers in 1984 -- one of just two seasons in which he hit more than 20.

Josh Reddick: The first-year A's outfielder has hit 31 in 2012 with a week to go. The former Red Sox prospect broke into the 30-homer club with a bang, hitting No. 30 and 31 in the same game after sitting on 29 for nearly two weeks.

Matt Stairs: Before he became one of the best game's best pinch hitters the late-bloomer from Canada had a nice run in the late 1990s with the A's, and in 1999 he led three A's with at least 30 homers with 38.

Terry Steinbach: Always a productive hitter but whose biggest attribute was his steady influence on the pitching staff during the Bash Brother era, the catcher got into the swing of things in a big way in 1996 with 35 home runs -- 20 more than the second-best power showing of his 14-year career.

Nick Swisher: The A's first pick from the much-hyped -- and highly-debated -- Moneyball draft of 2002, Swisher was an instant fan favorite and in 2006, his second full season, swatted 35 home runs to form a dynamic 1-2 power punch with Frank Thomas.

Miguel Tejada: Along with Eric Chavez formed one of the most productive left sides of the infield in the early 2000s, and Miggy was on the top of his game from 2000-03, hitting at least 30 homers in three of those seasons, including a career-high 34 in his MVP seasons of 2002.

Frank Thomas: The Big Hurt exceeded all expectations in his first stint with the A's, in 2006, slamming 39 home runs, helping lead the playoff breakthrough and a finishing fourth in the A.L. MVP race.